Improvement in fastening for sheet-metal joints



uid igiene- @wat @im HORACE EVERETT, OF PHILADELPHIA, PENNSYLVANIA.

Leners Patent No. 85,438, dem Damm/ree, 1868.

IMPROVEMENT INQFASTENING IEOR SHEET-METAL JOINTS..

The Schedule referred toil; these Lettere Patent: and making part of the same.

To all whom /itman/.concern Beit known that I, HoRAcnEvnnnrr, of Philadelphia, Pennsylvania, have invented a Fastening for Sheet-Metal; and I do hereby declare the following to be afull, clear, and exact description ofthe saine.

My improved fastening consistsot` a lip, formed on one end of a strip of metal, and fitted into an incision, or on to an incision and pocket, formed on an otherI strip, or on the opposite end of the same strip, all substantially as described hereafter, so as -to foi-1n a tight joint, without the aid of solder, for boxes, tubes, o isheet metal.

.In order to enable others skilled in the art to make and use my invention, I will now proceed to describe the manner of carrying .it into effect, reference being had to the accompanying drawing, which forms a part of this specification, and in which- Figures 1 and 2 are perspective views, showing two ends of 'a strip of metalprepared for being connected l. together according to my improvement;

l `Figures 3 and 4, longitudinal sections on the line 1-2, figs. land 2; A

Figure 5, the same, showing the two ends of the l strip united;

Figure 6 illustrates my invention as employed in the construction of a shallow box or box-lid;

Figure 7, the invention used in uniting` thel strip forming the body of a deeper box; and

Figure 8, a modification of my invention.

Similar letters refer to similar parts throughout the several views.

On reference to figs. 1, 2, 3, 4, andv 5, A and A represent the two ends of a strip of tinned plate, such, for instance, as is employed in making the sides of a blacking-box, or ofthe lid of a box, and in the end, A7 is made, by a suitable instrument, a semicircular incision, c, the lip b thus produced being depressed below the other portion of the strip, by making a bend at d, which extends transversely from one end of the semicircular cut to the other. (See gs. 1 and 3.)

The other end, A, of the strip is cut transversely to an extent sucient to admit the lip b, and simultaneously with the making of this cut, a pocket is swaged or otherwise formed on the 4under side of the end, A', of the strip, of a shape corresponding with that of the iip. f

The two ends of the strip are now so adjusted that the end, A, will pass over the-end, A', while the lip b will pass through the incision c, the lipftaking its place in theI recess, on the under side of the end, A', While the projection formed on the npperside of the latter lits in the opening oi' the end, A, of the strip, which is now placed over a suitable rest or anvil, and after a smart blow or suitable pressure is imparted to the parts thus fitted together, the joint will be complete, andthe ring nlay be subjected to the action of suitable rolls for forming the rib j', iig. which adds to the security of the joint, or, if desired, the top, IL, of the lid or box, g. 6, may besecured to the side simultaneously with the making ofthe rib j, and by the same machine by which the latter is formed.

It will be seen 'that the shoulder formed by bending the lip fits and bears against the edge of the cut made in the opposite end of the metal, the ready withdrawal of the lip being thus prevented.

Although I have described a recess as being formed on the under side oi' the end, A', simultaneously with the making of the incision e, it should be understood that this is not absolutelyy necessary in carrying out my invention, as the said recess for the reception of the tongue can be as eii'ectually formed by the blow'or pressure which completes the fastening.

It is not essential that the lip b of the end, A, shouldbe of a sernicircular forni. It may .beef the shape illustrated in iig. 8, for instance, or any other form which 'may be deemed ap1n'opriate.

In making deep boxes or cans, two or more lips and corresponding incisions, may be used, three being shown in fig. 7.

Itwvill be evident `that my invention is applicable to.

this specification, in the presence of two subscribing' Witnesses.

Witnesses:

JOHN WHITE, 0. IB. Panni.

HORACE' EVERET'I. 

